Jimmy Fallon's debut as 'Tonight' host tops Conan O'Brien's start

In this photo provided by NBC, Jimmy Fallon appears with Will Smith, left, during his "The Tonight Show" debut on Monday, Feb. 17, 2014, in New York. Fallon departed from the network's “Late Night” on Feb. 7, 2014, after five years as host, and is now the host of “The Tonight Show,” replacing Jay Leno after 22 years. (AP Photo/NBC, Lloyd Bishop)
(The Associated Press)

In this photo provided by NBC, Jimmy Fallon appears during his "The Tonight Show" debut on Monday, Feb. 17, 2014, in New York. Fallon departed from the network's “Late Night” on Feb. 7, 2014, after five years as host, and is now the host of “The Tonight Show,” replacing Jay Leno after 22 years. (AP Photo/NBC, Lloyd Bishop)
(The Associated Press)